21431423032 has 8 divisors (see below), whose sum is σ = 40183918200. Its totient is φ = 10715711512.

The previous prime is 21431423009. The next prime is 21431423047. The reversal of 21431423032 is 23032413412.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21431422988 and 21431423006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1339463932 + ... + 1339463947.

It is an arithmetic number, because the mean of its divisors is an integer number (5022989775).

Almost surely, 2^21431423032 is an apocalyptic number.

It is an amenable number.

21431423032 is a deficient number, since it is larger than the sum of its proper divisors (18752495168).

21431423032 is a wasteful number, since it uses less digits than its factorization.

21431423032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2678927885 (or 2678927881 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21431423032 its reverse (23032413412), we get a palindrome (44463836444).

The spelling of 21431423032 in words is "twenty-one billion, four hundred thirty-one million, four hundred twenty-three thousand, thirty-two".